... Steel pipeWeifang East Steel Pipe Co., Ltd. produce the high quality steel pipe, including ERW and seamless pipe. Standard: ASTM ... fluid, fire fighting system sprinkler pipe, structure pipe, scaffolding pipe, fence tubing, oil field pipe, Surface coating: hot dipped galvanized ... ends, shouldered ends Shape: Round, Square, Rectangular, special shape Certificate: ISO9001, CE, UL, API 5L, API ...